$ni\:sin\left(60\right)\:=\:nr\:sin\left(40\right)$
$5x=-5$
$3x^2+8xy^2-10x^2y+2xy+7x^2y$
$\left(-2-3\right)-\left(-1+8\right)$
$-6-5x-6x=16$
$-\left(x-3\right)\left(x-1\right)$
$\frac{7}{2}^{-4}$
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